Buttonhole-cutting mechanism



June 13, 1933. A, R', woop BUTToNHoLE CUTTING MEcHANIsM 4 Sheets-Sheet 1 Filed Dec. 4. 1931 Alfred R. Mod.

June 13, 1933. A. R. woon BUTTONHOLE CUTTING MECHANISM 4 Sheets-Sheet 2 Filed D90. 4. 1931 gmc/nto@ v Alfred R Mod.

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June 13, 1933. A R WOOD 1,914,002

BUTTONHOLE CUTTINGl MEGHANISM Filed Dec. 4. 1951 4l sheetsneet 4 aum,

* 12STATE-1s Patented June 13, 1933 l"ALFIRED nwwobn, crearne-moar; eoNnEc'rIoU'r, AssIGNoR l'roert-1E velimina MANU- ,I'ACTURING coMrANY, ori ELIzeer:TH,` NEW' Jnnsmnn CORPORATION 'oF vmau/'f' surnomme-eurem@MECHANISM l if Appncation nieainecembr 4, 1931. serial No. 578,967.

' This vinvention relates tol sewing-'machines ofthe ltype usedrforfmaking buttonholes and has for an object to provide such a machine ing a pair 4of pivotedv cutter-leversv having a powerful cutting action, enabling the de- 1 vice to -cut through heavy material, without restriction of the depth of the throat. of `the cutter-levers. v t

*'10 .'With the above and other objects in view,

'skilledinthe art. ..1

Fig. -1 is` a :vertical sectional view taken longitudinally of the frame of a buttonhole sewing i machine, showing the 1 buttonholecutting'mechani'sm inV side elevation thecutter-'levers beingxat restin retracted position. Fig. 2 is a similar view with the cutter-levers f adi'anced .tobuttonhole-cutting position and I partially closed upon the; work.;v Fig-3 isja viewv similar, to, Fig. 2 but with the vcutteris a horizontal section through the bracketarm standardof the mahine,showing vthe .against thethrust ofthe needle bythe usual needle-throat member or button 9 whichis 'but-tonhole-cut-ting :mechanism in plan.` Fig. 5y is ya reverse side elevationof Athe rear endportion of the upper cutterlever together with its actuating came.; Fig-6' vis atransverse section through the rear end-portion ofthe upper cutter-lever -onthe vline 136.-,6, Fig. 5, showing the, actuatingc-am inelevation. Fig. "('l is a; ,disassembled perspective view. lofthe front end-portion of the upper Acutter,-lever or punch-carrier. *F.ig.. k8 is a similar view -of the parts from; anotherA angle-Fig. 9 is a disassembledperspective view of the-.punch Yand kits actuatingleven Fig-1()- is a vsection taken on the line 10-.10, Fig,i 1.A Fig.l 11 is a 'plan View of the die-.element of the buttonhole-cutting mechanism,rand Fig. 12 is asectional view of the die-element.

' The sewing machine illustrated is ythe buttonhole sewing type and desi-gnedparwith a buttonhole-cuttingmechanism -includv levers fully `.closed upon the Iworinl Fig.4 4

'ticularly to cut and sew l round Ventilating eyelets in heavy materials, such as the sidewalls of mattresses, quilts, etc.

For cutting holes in work of this character is subjected to severe stra-in which is likely to-cause` distortion vor breakageof the parts.

`Vhilaof course, ithe power of simple cutterlevers may be increased by shifting the fulcrum of such rlevers nearer vtothe cuttingelements, such a shift will unduly restrict the depth lof the -throat .of the cutter-leversand will also seriously reduce the vertical separavtion ofthe cutting elements necessary for the admission of thick-work. v e

The machine 4is constructed with abcd l, from which rises the standard 2 of the bracket-arni terminating in the head 4 carrying the usual reciprocacting and rotating needle- 'ymechanismv 5 Whichcooperates with the usual looper-mechanism 6 below the b edl in the formation of button hole-overseaming stitches; the mechanism being. substantially that disclosed in the AllenPatent No. 1,162,-

ZOT, of November 30, 1915.

The worlcis clamped .between theilower Work-supporting plates 7 and upper clamplfeet-8 which expose a circular areaof work for `the actionof thestitch-forming mechanism. .During the sewing operation, thea WorkWithin this exposed area is supported pivotally mounted atl@ on the :turret 1 1 carryingvthe lecher-mechanism 6. Dl'lring'the|` sewing, Athis,needle-throat member isrlgrdly` maintained in the yvertical position shownin Fig.,l,:but is temporarily tilted laterally out of sewing position to the position shown in Fig. 2, when `the cutter-levers are advanced.A to; cut the buttonhole or eyelet, as disclosed ntheiart, to l.cover anoverseamed hole of any size, shape,.or contour, including round eyelets.

.1 nmachines yof the :type in question yit is common `Itoprovide al b uttonhole cutter-shaft thesimple lever-mechanism heretofore used'.I

' front end of the upper cutter-level.' 19 by the bolt 25.

v cutter-lever 19 to bear upon the sides of the iso 12 which is stationary during the sewing and makes one complete revolution before or after the stitch-forming ymechanism operates. This cutter-shaft carries a cutter-advancing and -retracting cam 13 which is connected by the usual link 14 to the travelling fulcrumblock 15 slidably mounted in suitable ways in the bed 1. The cutter-shaft also carries the cutter-closing cams 16` and 17.

F ulcrumed on the screw-pin 18 carried by the travelling fulcrum-block 15 are the upper and lower cutter-levers, 19 and 20, respectively, the rear ends of which are cooperatively related with the respective cutterclosing cams 16 and 17.

The lower cutter-lever 2O has mounted vthereon by screws 21 a die 21 which is adapted to be entered by the punch 22 slidably mounted in the hole 23, Figs. 7 and 8, in the head-piece 24 which is secured to the rlhe lever 19 is formed with a transverse groove 26 entered by a transverse rib 27'on the head 24, and adjusting screws 28 are provided at opposite sides of the upper Vhead-piece 24'and enable the punch 22 to be accurately registered with the stitched iigure or eyelet. The die 21 is adjustable on the lower cutter-lever 2O to register with the punch 22; the holes for the screws 21 being enlarged for this purpose.

` The punch 22 is formed with a guide-head '22 which fits between the spaced ears 29 of 'the head-piece 24. Such guide-head 22 is formed with a throat 30 entered by the rounded tongue 31 at the forward end of the auxiliary punch-operating lever' 32 fulcrurned at 33 -on the upper cutter-lever 19.

second auxiliary punch-operating lever 34 1s fulcrumed on the u per Cutter-lever 19 at 35 1n position for its orward end to engage punch-operating lever 32. A leaf-spring 36 screwed to the upper cutter-lever bears upon the adyustable abutment-screw 37 and yieldingly urges the punch-element 22 upwardly 1n its carrier-head 24, holding such 'punchelement in the position shown in Fig. 1, rel- ,A ative to the upper cutter-lever 19.

Mounted on the rear end of the second i auxiliary-lever 34 is a screw 38 which passes through a`slot 39 in a link 40 `anchored by the screw41 to the lower cutter-lever 20.

The cutter-levers are yieldingly held open by the spring 42 which connects them together and also holds such levers in engagement with their respective cams, 16 and 17.

Operation 'in Fig. 1. The screw-pin 38 is intermediate Vthe ends of the slot 39 in the link 40.

punch-carrier,

proachmg said die and punch-carrier while The between-substance or work-piece w is introduced into the work-clamp Vand held as shown in Fig. 1.

After the machine is started the cuttershaft 12 is connected to its driving means for one revolution and then brought to `rest in the customary manner. During the rotation of the cutter-shaft, the cam 13 first advances the fulcrum-block 15 to carry the punch and die to cutting position. Following this the cam 16 partially closes the upper cutter-lever to the position shown in Fig. 2, the screwpin 38 travelling idly along the slot 39 in the link-40 and, because of this lost motion, causing no motion of the punch 22 relative to its carrier-lever. rlhe cam 17 has also partially closed the lower lever 20 and slightly elevated the die. A

During the continued movement of the shaft 12, theA screw-pin 38V strikes the upper end of the slot 39 in the link 2O and, as the cutter-levers are further closed by the cams 16 and 17, the punch is powerfully and suddenly driven through the work w and sligh'tany possible sticking tendency of the punchV in the die, the upper cutter-lever may be provided at its rear end with a block 43 having in its side face a cam-slot 44 which is entered by the roller 45, as shown in Figs. 5 and 6, to positively retain the lever 19 in engagement with the cam 16 while the roller 45 .is

travelling along the cam-slot 44. under the rearward endv of the auxiliary y 1. Buttonhole-cutting mechanism for sew-iur ing machines having, in combination, a die, a die-carrier, a punch-carrier, a punch mounted on and movable relative to said means for relatively apsaid punch is held stationaryrelative to said punch-carrier, and means for thereaftermoving said punch relative to said punch-carrier and into said die, said means including a.`

lever system mounted on the punch-carrier and connected to said die-carrier. r l

2. Buttonhole-cutting mechanism.v for sewing machines having, in combination, avdie,

`a die-carrier, a punch-carrier, a punch.

mounted on and movable relative to said punch-carrier, means for relatively approaching said die and punch-carrier while said punch is held stationary relative to said punch-carrier,and means for thereafter mov-r` 111g Said punch relative to sa1d punch-carrier and into said die, said means including a lever system mounted on the punch-carrier and having a lost-motion connection with said die-carrier so as to have a sudden action as the punch-carrier and die are completing their relative approach.

3. In buttonhole-cutting l mechanism for' sewing machines, the combination with a diecarrying member, of a pivotally mounted punch-carrying lever, a punch-member mounted on and movable relative to said lever, an auxiliary punch-operating lever fulcrumed on said punch-carrying lever and connected to said punch, an operative connection between said auxiliary lever and said die-carrying member, and means for rocking said punch-carrying lever on its pivot.

4. In a buttonhole sewing machine, a buttonhole cutter-shaft, upper and lower cutterlevers pivota-lly connected together, anv upper cutting element carried by and movable relative to the upper cutter-lever, cutterlever-closing means on said cutter-shaft, and means for moving said upper cutting-element relative to said upper cutter-lever, said means including an auxiliary cutter-lever ulcrumed on said upper cutter-lever and connected to said lower cutter-lever.

5. Compound buttonhole-cutting` mechanism for sewing machines comprising a travelling fulcrum-block, cutter-levers ulcrumed on said block, a cutting element carried by and movable relative to one of said levers, compound lever-mechanism carried by said leve-rs and connected to move said cutting element relative to its carrier-lever, a cutter-shaft, and cams on said shaft and connections for imparting travelling movements to said fulcrum-block and for closing and opening said clutter-levers.

6. Compound buttonhole-cutting mechanism for sewing machines comprising, relatively movable pivotally connected cutterlevers, a cutting element carried by and movable relative to one of said levers, and compound lever-mechanism, carried by said levers andconnected to be actuated by the relative pivotal movement of said levers and to move said cutting element relative to its carrierlever. w

In testimony whereof I have signed my name to this 'specilicationl ALFRED R. woon 

